（（20×1.9+19.1×2.8）×2.72+2×5.8×1.65
    3.14×0.82×((16.9-0.5)-6.9)/ln( 1+2.3/35.7)+( 11.65-1.5)/（1.5ln( 1+0.2 11.65/35.7))
    2×10√(0.89×16.9)
    16.9/(0.7/0.03456+3.4/(5.72×10-4)+0.8/(4.6×10-4) +4.1/(1.74×10-4) +1/(1.73×10-4) +1.6/(8.003×10-4) +5.3/(8.004×10-4))
    16.9/(0.7/0.03456+3.4/(5.72×10-4)+0.8/(4.6×10-4) +4.1/(1.74×10-4) +1/(1.73×10-4) +1.6/(0.003×10-4) +5.3/(0.004×10-4))
    2×10√(0.82×16.9)
    16.9/(0.7/0.03456+3.4/(5.72×10-4)+0.8/(4.6×10-4) +4.1/(6.74×10-4) +1/(6.73×10-4) +1.6/(8.3×10-4) +5.3/(10.4×10-4))
    (16.9-0.5+6.9)/2
    (6.1×22)/ (6.8×10)
    (6.9×22)/ (6.8×10)
    (5×22)/ (6.8×10)
     （7×22）/（6.8×10）
     （7×22）/（6.8×1000）
     7×22/6.8×1000
     7×22/6.8×10
    （20×1.9+19.1×5.7+21×1.1）×2.66+2×30×1.63
    （20×1.9+19.1×5.7）×2.66+2×30×1.63
    （20×1.9+19.1×5.7）×2.72+2×5.8×1.65
    （20×1.9）×2.72+2×5.8×1.65
    （20×1.9）×2.30+2×41.7×1.52

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